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During a chemical reaction, gas evolves and the container feels warm without external heating. What is the most appropriate conclusion?

Answer and explanation

Correct answer: A gaseous product has formed and the reaction is exothermic.

Evolution of gas indicates that a gaseous product is being formed. If the container becomes warm without external heating, heat is being released by the reaction; therefore, the reaction is exothermic. In contrast, an endothermic reaction absorbs heat from its surroundings and would not normally make the container warm.

Related tags

ScienceClass 10Chemical ReactionsGas EvolutionExothermic ReactionObservations

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